I haven't had any issues with the sound, bluetooth connectivity or battery life. the wire cables that came with my MX1Pro IEM. The wired version holds its shape better, which allows me to fit it nicely to my ear. It's more of a thin wire that won't stay in place either. I use the MX1 Pro for church surveillance and they work great. I have a BT adapter to be able to work with connected IEMs. SO. Safer when standing almost still. Less safe to handle. It doesn't seem to make much sense.
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